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2020 Census: Address Canvassing Operation

Archived Video: August 12, 2019 - News Briefing to Announce First Major Field Operations for 2020 Census

Purpose of Address Canvassing

The Address Canvassing Operation serves two purposes:

  1. Deliver a complete and accurate address list and spatial database for enumeration.
  2. Determine the type and address characteristics for each living quarter.

This operation implements methods to improve and refine the U.S. Census Bureau’s address list in advance of the 2020 Census. The Census Bureau needs the address and physical location of each living quarter in the United States and Puerto Rico to conduct and tabulate the census. An accurate list ensures that residents will be invited to participate in the census and that the census counts residents in the correct location.

Video: Address Canvassing for the 2020 Census

Address Canvassing is Now Conducted in Two Ways:

In-Office Address Canvassing uses imagery to detect housing change or stability over time throughout the United States and Puerto Rico and to compare the number of housing units on the ground to the number in the Census Bureau’s Master Address File. In-Office Address Canvassing was part of a suite of nationwide in-office methods used by the Census Bureau to maintain and update its address list, including processing of address lists from the US Postal Service and tribal, state, and local governments.

In-Field Address Canvassing, field staff, known as listers, visit specific geographic areas within the Self-Response type of enumeration area (TEA) where in-office methods could not assure a complete and accurate address list. Listers identify every place where people could live or stay, comparing what they see on the ground to the existing census address list and verifying, correcting, or adding address and location information, as appropriate. Listers knock on doors at every structure in order to verify or update information and inquire about additional living quarters in the structure and/or on the property. If the lister does not find anyone at home, they verify or update address information by observation. 

2020 Census: In-Field Address Canvassing (IFAC) Viewer

Updating and Validating the Address Frame

The Address Canvasing Operation is part of a suite of processes employed by the Census Bureau to update and validate the address frame for the 2020 Census prior to Census Day:

  • Biannual processing of the U.S. Postal Service’s Delivery Sequence File (DSF).
  • Tribal, state, and local government address lists and roads files provided through the Geographic Support System (GSS) Program.
  • Ungeocoded Resolution Project, in which Census Bureau staff research and identify the census block to which an address should be assigned when the automated geocoding process is unable to make the determination.
  • Local Update of Census Addresses (LUCA) Program and the LUCA Appeals process (provides an opportunity for tribal, state, and local governments to review the Census Bureau’s address list for their respective jurisdictions).
  • New Construction Program is available to local governments to provide addresses for housing units built after LUCA and ready for occupancy by Census Day.
  • Count Review is conducted in collaboration with state demographer members of the Federal-State Cooperative for Population Estimates (FSCPE). It provides an additional opportunity to review counts of housing units prior to the 2020 Census and update as necessary.

Each of these programs and processes serves to validate addresses in the Master Address File, correct address locations and provide addresses that may not be included in any of the other address datasets. Taken together, along with in-office address canvassing and in-field address canvassing, this suite of programs and processes provides multiple opportunities for the Census Bureau to develop an accurate address list.

Block Assessment, Research and Classification Application (BARCA)

The Census Bureau developed the Block Assessment, Research, and Classification Application (BARCA) for use in conducting In-Office Address Canvassing. BARCA provides reviewers with access to baseline (circa 2010) and current imagery to assess change or stability in housing within each of the 11.1 million census blocks over time. Reviewers also use BARCA to compare the number of housing units visible in current imagery with the number of addresses in the Census Bureau’s address list for each block.

Individual census blocks are classified as:

  • “passive” if the number of housing units visible in current imagery match the number of addresses in the MAF.
  • “active” if comparison of imagery to the MAF detected undercoverage or overcoverage in the MAF.
  • “on hold” if census blocks for which the in-office address canvassing reviewer could not make a determination, generally due to cloud cover in imagery.
  • “trigger” for address updates from the DSF or tribal, state, or local governments as well as new imagery that prompts a re-review using BARCA.

Blocks that are in active or on-hold status in the Spring 2019 will be sent to in-field address canvassing for resolution.

BARCA Examples:

Active Blocks

Clarksville Township, Merrick County, Nebraska ( baseline | current )  [PNG]

Lorton, Fairfax County, Virginia ( baseline | current ) [PNG]

New York, Queens County, New York ( baseline | current ) [PNG]

Passive Block

American Fork, Utah County, Utah ( baseline | current ) [PNG]

Page Last Revised - October 28, 2021
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